[modeleng] Re: Traction Power

Hi All,
I was sitting on the riding car behind the loco with my heels dug in to stop 
it moving.
The loco is a Class 52 ( not a kit built one) with six motors.

Clif
----- Original Message ----- 
From: "Tony Wells" <oaksfield@xxxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Saturday, August 25, 2007 10:44 PM
Subject: [modeleng] Re: Traction Power


> Hve you actually measured pull or load though Clif? It sounds more as if
> your 47 lbs is the load equivalent, not the traction / motive force! What
> size loco and/or motor are we talking about though please?
>
> Tony.
>
>
> ----- Original Message ----- 
> From: "Clifton Walker" <clif.gwr@xxxxxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Saturday, August 25, 2007 8:58 PM
> Subject: [modeleng] Traction Power
>
>
>> Hi All,
>> When I was up at the Harrogate show, one of the many trade stands had 
>> some
>> very nice dial type scales for a £1.
>>
>> I have always had the idea to put a set of scales as a coupling between a
>> loco and the riding car, just to see what pull the loco was exerting so I
>> purchased a set. Last of the big spenders, thats me.
>>
>> Today having a run in the garden with one of my electric locos I gave it 
>> a
>> whirl.
>>
>> She could give 47 lbs pull before wheel slip occured.
>>
>> Now the only reference I have got is from Greenlys book on loco design
>> which states that 1lb traction can pull 25lbs load.
>>
>> If I multiply 47 X 25 I get 1175 pounds. If I then divide by 160 lbs as
>> the average persons weight this give a passenger load of seven including
>> the driver.
>> The snag is that I know that this loco can easily pull 10 passengers plus
>> the driver so  what is wrong?
>> Does anybody have any better info about traction to load ratio.
>>
>> Has any body else got any traction figures for various locos as a matter
>> of interest.
>>
>> Regards
>>
>> Clif
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>
>
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